Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2018

Schedule of useful life for property, plant and equipment

Depreciation is provided on property, plant and equipment, including assets held under capital leases, primarily utilizing the straight-line method over the following estimated useful service lives or lease term:



Computer hardware and office equipment		3-5 years
Computer software		3-10 years
Autos and light trucks		5-7 years
Furniture, fixtures, and trailers		7-10 years
Composite mats (rental fleet)		10-12 years
Machinery and heavy equipment		5-15 years
Owned buildings		20-39 years
Leasehold improvements	Lease term, including reasonably assured renewal periods

Schedule of the cumulative effect of changes for adoption of new guidance

The cumulative effect of the changes made to our consolidated balance sheet for the adoption of the new guidance for revenue from contracts with customers and the income tax consequences of intra-entity transfers of assets other than inventory were as follows:



(In thousands)	Balance at December 31, 2017	Impact of Adoption of New Revenue Recognition Guidance		Impact of Adoption of New Intra-Entity Transfers of Assets Guidance		Balance at January 1, 2018
Receivables, net	265,866	(8,441	)	—		257,425
Inventories	165,336	5,483		—		170,819
Deferred tax liabilities	31,580	(679	)	4,485		35,386
Retained earnings	123,375	(2,279	)	(4,485	)	116,611